Working left to right, I see : no evidence of a stubb buttstock or recoil assembly tube under his right hand - there's some funky semi-circular metal assembly just forward of the ejection port and his left hand grips the legs of a bipod (I thought FAL, but it might be a DP28 - look at the big round pivot points under the front sight) and at the muzzle brake looks like an AK47 slant.

Looks like someone grafted an AK front sight onto the flat top of the front gas assembly ring.
No forearm, obviously, but that looks like a FAL or AK47 pistol grip.
Still can't figure out what the 1/4 circle assembly is, in front of the ejection port.